Rotary pump



April 7, 1936.. 'H F MART|N 2,036,7l

ROTARY PUMP Filed April 2l, 1934 2 Sheets-Sheei. 1

,2 /5 F l [Z5 f7 5* Eig-:1. 4. Henry www.

ATTORNEY.

April 7, 1936. H. F. MARTIN V 2,036,711

ROTARY PUMP Filed April 21, 1954 sheets-sheet 2 INVENTOR. Hag/72:9 77' Maz/727.

ATTORNEY.

'Patented pr. 7, 1936 PATENT OFFICE ROTARY PUMP Henry F. Martin, Detroit, Mich., assignor of onetenth to Charles E. Wisner, and forty-live onehundredths to Raymond J. Silden, both of Detroit, Mich.

Application April 21, 1934, Serial No. 721,659

5 Claims.

This invention relates to rotary pumps and the object of the invention is to provide a rotary pump including a rotor carrying a series of rollers riding in contact with the stator and in which the rollers are supported on oating cam members positioned in the housing.

Another object of the invention is to provide a rotary pump comprising a rotor provided with a series of radial slots in which the rollers are positioned, the inner rollers being supported on floating cam members in the pump housing whereby the outer rollers are maintained in contactwith the stator.

Another object of the invention is to provide a rotary pump including a rotor having radial slots in which the rollers are loosely positioned, the inner rollers in each slot being provided with sloping faces and a pair of floating cam members beingpositioned on lopposite sides of the rotor between the sloping ends of the inner rollers and provided with sloping faces on which the inner rollers are adapted to ride during rotation of the rotor to support and maintain the outer rollers in contact with the stator.

Another object of the invention is to provide a rotary pump of the character described in which the floating cam members are provided with sloping conical `faces whereby the cam membersmay be adjusted toward each other to move the rollers outwardly. and take up wear.

These objects and the several novel features of the invention `are hereinafter more fully de- .scribed and claimed and the preferred form of kconstruction by which these objects are attained is shown in the accompanying drawings in Which- Fig. V1 is asectional vviewfof a rotary pump embodyingmy invention, .the rollers,roto r and iloating cams beingsh'ownin elevation.

riga is ajseqtidntaken 4on. une {2M-2 of Fig. 1. 's lig. '31 is.` a. `view similarv tdFig. `1 `showing the rotor ,in -a diierent position.

i isla" section ifhbllgh a multipleroller AFig. j is section through 'an' 'alternative and (Cl. 10E- 136) A cylindrical lining 'I is fixedly mounted in the stator I and is provided with an opening 8 registeringwith the inlet chamber 3 and with an opening 9 registering with the outlet chamber 4. The rotor, as shown more particularly in Fig. 1, 5 comprises an outer annular portion I0 of the full width of the central pump chamber as shown in Fig. 2 and a concentric recess Il is formed in one side thereof while a similar concentric recess l2 is formed in the other side thereof. 10

The rotor thus formed is provided with a series of three radial slots I3 and each-radial slot is provided with an outer roller I4 and with an inner roller I5 which rollers are loosely positioned in the radial slots I3. A metal cam ring I6 is 15 positioned in the recess II in the rotor between the ends of the three rollers I5, as shown in Fig. 1. A similar metal ring I1 is positioned in the recess I2 between the opposite ends of the three rollers I5. These rings I6 and I'I are freely 20 mounted between the ends of the three rollers I5 and these rings are provided with sloping outer faces while the rollers I5 may also be provided with companion sloping faces at the ends to rest on the rings I6 and Il, as shown-in Fig. 2.

The drive shaft I8 for the pump extends through the center of the rotor and is secured thereto by a key I9. This shaft is rotatably mounted in a bushing 20 provided in the cover member 2l and in a bushing 22 provided in the 30 extension 23 of the housing I. 'Ihis shaft is also provided with a collar 2d and a spring 25 is positioned behind the collar and is retained in place by a plug 2t threaded into the end of the extension 2.1i.

In operation, the shaft I8 is rotated to rotate the rotor. This rotor carries the rollers It and I5 around therewith in the slots i3 as will be readily understood from Figs. l and 3. The rotor is rotated in a counter-clockwise direction and 40 by the eccentric`vposition' of the rotor in relation to the stator iiuid is drawnirom the inlet chamber i into the chambers between the successive rollers rings it and i "i therollers are always maintained in contact with the stator due to the fact that the rollers Il t continuously ride onthe outersurfiao'e ofy the cani` rings It and Il; sloping faces voi' the cam'rings, the rollerslt will automatically adjust themselves,` to

Due to the V proper position in maintaining therollers Min contact with v the stator. The pump will also operate in a reverse direction in which case the chamber 4 becomes the inlet chamber and the chamber 3 becomes the discharge chamber.

By providing two rollers, as shown in Figs. 1 and 3, the rollers I5 will rotate in a counterclockwise direction while the rollers I4 will rotate in a clockwise direction. This is due to thefact that the rollers I5 are riding on the cam rings I6 and I1 and the rollers I4 are riding on the inner face of the stator so that there is no wear between the rollers I4 and the stator and no wear between the rollers I5 and the cam rings I6 and I1 and if the rollers are of approximately the same diameter there is no appreciable slippage between the rollers and consequently no wear between the rollers and thus the only wear on the rollers would be where the rollers contact the faces of the slots I3 in the rotor.

An alternative form ofconstruction is shown in Figs. 4 and 5 in which two outer rollers 21 are provider and supported on an inner roller 28, the rollers being positioned in an enlarged radial slot in the rotor. The rollers 28 are supported on two floating cones 29 and 30 and the rotor is provided with an extension 3| which is secured to the shaft 32.by means of the key 33. In this construction the cones 29 and 30 are mounted in the central opening of the rotor between the three inner rollers 28 and the rollers 28 maintain each pair of rollers 21 in contact with the inner face of the stator so that a double seal is provided adjacent each rotor slot. These cones are here termed oating cones due to the fact that they are moved concentrically about the axis of the stator through the varied position of the rollers during rotation of the rotor and thus in a sense are floating and are not axially fixed. Due to the difference in angular position of the stator face in relation to the outer circumference of the rotor the rollers 21 may compensate in angular position for this variation. For instance,

at the top of Fig. 4 both rollers 21 are in approximately the same angular position in relation to the roller 28. In the position shown at the left of Fig. 4, the roller' 21a is advanced beyond the roller 21b and in the position shown at the right of Fig. 4 the roller 21D extends outwardly beyond the roller 21a. With this arrangement shown in Fig. 4, the rollers may therefore compensate and accommodate themselves to the stator face and, at the same time, provide a double seal.

As will be noted from Fig. 5, a shoe 34 is provided to which a screw shaft 35 is secured and this screw'shaft is threaded through the portion 36 of the cover 31 and is provided with a lock nut 38. By removing the cap 39, the lock nut 38 may be released to allow the screw 35 to be threaded inwardly to force the cone 29 toward the cone 30. This will spread the rollers 28 apart and force the rollers 21 outwardly and provides a means for taking up Wear of the rollers 21 or 28 or wear on the cones 29 and 30. After the screw 35 has been properly adjusted, the lock nut 38 may be again tightened.

An alternative form of the pump is shown in Figs. 6 and 7 which is probably the simplest form of the pump. In this form, lthe housing 40 is provided with bushings 4I and 42 for the shaft 43. This shaft 43 extends through these bushings and is secured to the hub 44 of the rotor by a key 45. This rotor is provided with an integral portion extending into the stator chamber and having three radial slots for the rollers 41 leaving three driving portions 48. The portions 48 are arranged on a circle eccentric to the cylindrical pump liner 49 and the rollers 41 are arranged to ride in contact with the inner cylindrical face of the pump liner 49. In order to maintain the rollers 41 in contact with the liner 49, a fourth roller 50 is positioned between the three rollers 41 and this fourth roller is free so that it will automatically seek a position centrally of the three rollers 41.

The inlet conduit 5I opens into the inlet chamber 52 and this chamber opens into the interior of the pump through the port 53 while the discharge port 54 opens from the opposite side of the pump into the discharge chamber 55 and, in this oase, the rotor rotates in a counter-clockwise direction. If the pump is arranged for the rotor to rotate in a clockwise direction, the inlet and discharge ports are reversed.

The operation of the device will be more readily understood from Fig. 7 in which the rotor comprising the three portions 48 is rotated in a counter-clockwise direction. As the rotor rotates, the three rollers 41 roll on the inner cylindrical face of the pump liner 49 and as these three rollers are all of the same diameter, the compensating roller 50 will rotate in the opposite direction so that there is no friction between the rollers. It will be noted that the roller 50 automatically assumes a position eccentric to the center of the shaft 43 but centrally of the cylindrical stator liner 49 and in this position maintains the three rollers 41 at all times in contact with the inner cylindrical face of the pump liner 49. By this arrangement, the iuid is drawn from the inlet port 53 and is carried around the right/ side of the rotor and is forced out through the discharge port 54. In this pump, all four rollers 41 and 50 rotate freely and, at the same time, have maximum effectiveness in pumping. Should the rollers become Worn, the cap 56vmay be removedfrom the pump by removing the bolts 51 and the roller 50 may be removed and may be replaced by a roller of slightly greater diam- ,eter to take up the Wear.

From the foregoing description it becomes evident that the device is very simple and efficient in operation, will not easily get out of order, is composed of few parts and is of consequent low manufacturing cost and provides a device which accomplishes the objects described.

Having thus fully described my invention, its utility and mode of operation, what I claim and desire to secure by Letters Patent of the United States is- 1. In a rotary pump, a stator provided with an interior cylindrical face and having inlet and exhaust ports, a rotor rotatably mounted in the stator, the rotor being spaced from the cylindrical face of the stator through a portion of its circumference, a pair of conical members positioned within the stator chamber and each having a circular conical face, the rotor being provided with a series of radial slots, a plurality of rollers positioned in each radial slot, the inner roller in each slot being provided with conical ends resting on the conical members, said conical members being independently supported in po- 'sition by the respective conical ends of the inner roller permitting disalignment of the axes of the conical members to compensate for imperfections in construction and Wear, means for adjusting one of the conical members axially and a shaft for driving the rotor.

2. In `a. rotary pump, a stator provided with an interior cylindrical face and having inlet and exhaust ports, a rotor rotatably mounted in the stator, the rotor being spaced from the cylindrical face of the stator through a portion of its circumference, a pair of conical members freely mounted in the stator, the rotor being provided with a series of radial slots opening through the outer face thereof, a plurality of rollers posi- 'tioned in each radial slot, the inner roller in each slot riding on the conical members, said conical members being independently supported in position by the respective conical ends of the inner roller permitting disalignment of the axes of the conical members to compensate for imperfections in construction and Wear, means for adjusting one of the conical members toward the other andmeans for driving the rotor.

3. In a rotary pump, a stator provided with an interior cylindrical face and having inlet and exhaust ports, a rotor rotatably mounted in the stator, the rotor being spaced from the cylindrical face of the stator through a portion of its circumference, a pair of independently iloating conical members, the rotor being provided with a series of radial slots opening through the outer face thereof, a plurality of rollers positioned in each radial slot, the inner roller in each slot being provided with conical faces riding` on the conical members and means for driving the rotor.

4. In a rotary pump, a stator having inlet and exhaust ports and provided with an interior cylindrical face, a rotor rotatably mounted in the stator, the rotor being spaced from the cylindrical face of the stator through a portion of its circumference, a compensating roller positioned on each side of the rotor, the rotor being provided with a series of radial slots opening through the outer face thereof, a plurality of rollers positioned in each radial slot, at least two of the rollers in each slot riding in engagement with the cylindrical face of the stator and the inner roller in each slot riding on said compensating rollers, and means for driving the rotor.

5. In a rotary pump, a stator, a rotor mounted eccentrically in the stator, the rotor being provided With a series of radial slots, a series of rollers positioned in each slot, at least two of the rollers of each series contacting the stator face, and a compensating roller mounted centrally of the series of rollers and arranged so that a roller of each series of rollers rides on the compensating roller.

HENRY F. MARTIN. 

